Book-leaf.



No. 801,652. PATENTED OCT. 10, 1905. J. 0. DECKBRT.

BOOK LEAP.

APPLIGATION FILED JAN.6.1905.

UNITED STATES PATENT OFFICE.

JOSEPH O. DECKERT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OFTiVO-THIRDS TO CHARLES H. MANN AND HARRY A. PRIZER, OF PHILA- DELPHIA,PENNSYLVANIA.

BOOK-LEAF.

Specification of Letters Patent.

Patented Oct. 10, 1905.

To (1]! whont it nut-y concern:

Be it known that I, JOSEPH O. DEGKERT, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Improvement in Book-Leaves, of which thefollowing is a specification.

My invention relates to books, ledgers, or other assemblages of leaves,tightly or loosely IO bound, in which it is desirable to have leaves lieflat when the book is bound.

My invention relates more specifically to leaves themselves; and itconsists in aconstruction whereby the leaves are rendered more flexibleat the desired portion of each leaf than throughout the remainder of theleaves.

My invention consists in weakening a portion of the sheet againstbending strain and reducing the resistance to bending of a portion ofthis weakened part.

My invention relates more particularly to a construction wherein thesurface fibers of a portion of paper which would otherwise be held inrestraint by the sizing used in connection with the surface-formingprocess are either not sized during manufacture or are slightlyseparated or relieved from their restraint thereafter without removingthe same or reducing the thickness of the paper, whereby the leaf willlie flat when in position in an open book or hinder.

In order that that portion of the leaf from which the size has beenomitted or where the fibers have been relieved from restraint may not beless dense, and hence of appreciable greater thickness than the rest, itmay be rolled without the use of a sizing solution.

Figure 1 is a perspective view of a leaf intended for a book or hinder.Fig. 2 is an enlarged fragmentary perspective of the same. Fig. 3 is aperspective, with the supports removed, of a surface-forming device bywhich the paper may be prepared.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings, the sized leaf 10 is provided with a portion11, from which the size-finish has been omitted or whose fibers 12 havebeen relieved from the cohesion due to the surfacing process in anymanner. The portion 11, from which the sizing is omitted or has beenremoved, is preferably uniformly so treated throughout the extent of thesame, but may be varied, if desired. The treatment may be extended toboth sides of the leaf, as shown in Fig. 2, or may be upon one side ofsaid leaf only.

\Vhen both sides of the leaf are without sizing, the portions lackingsizing may be opposite to each other on the leaf, as in Fig. 2, orarranged in any other suitable manner. I may omit the sizing in theprocess of manufacture of the paper, as above stated, or the fibers maybe freed from the restraint due to the surfacing process, while the saidfibers are retained in their entirety and the thickness and strength ofthe paper at the point treated are not impaired. The surface fibers maybe freed from the restraint due to sizing in any suitable manner, as bysubjecting the portion of the surface of the paper to light brushing orbeating, as by a rotating brush, which lifts up the fibers of the paperfrom the position to which they have been forced by the rolling of thesurfacing process and in which they have been held by the action of thesizing or surface-forming solution.

In Fig. 3 is shown an apparatus for finishing a paper with a sizethroughout a portion of its surface and compressed without sizingthroughout that portion intended to be left more flexible than theremainder.

13 and 14 and 13' and 14: illustrate two pairs of rollers arranged inpairs longitudinally and vertically and provided with a tank 16 in whichthe rollers 14: and let lie and from which these rollers receive thesizing solution and with any suitable apparatus 16' for supplying sizeto the rollers 13 and 13. At a suitable distance from these rollers andupon shafts parallel to their shafts are arranged rollers 17 and 17, notprovided with sizing solutions, and of such width and so located that asheet of paper 19 passed through the sets of rollers in the direction ofthe arrow will receive a sized surface upon its outer border produced byrollers 13, 14, 13, and let and the sizing solution, while the portionof the surface lying between rollers 13 and 13 will not receive sizingmaterial, but will be acted upon only by rollers 17 and 17. Sheet 19will by this method of manufacture be sized throughout a desired portionof its width.

At a suitable point in the portion of the leaf which is freed from thestrain due to the sizing process or from which the sizing has beenomitted I crease thepaper, as at 20, preferably creasing it at toppoints 21 and 22 in opposite directions. These creases are but slightlyevident in the finished page, but when so made in a leaf of which thesurface fibers are loosened the center fibers are sufficiently disturbedto permit thereafter free bending of the leaf in either direction. Thecreases are preferably located in that part of the leaf which is freefrom the restraint due to the sizing operation and in the portion of itfarthest removed from the binding edge.

It will be evident that various changes may be made by those skilled inthe art which Will come within the scope of my invention, and

I do not, therefore, desire to be limited in every instance to the exactconstruction herein shown and described.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A sheet or leaf of paper or similar material, a portion of whichoffers less resistance to bending strains than the remainder, incombination with a crease within said portion.

2. A sheet or leaf of paper or similar material uniformly ofierin g lessresistance against bending strain throughout a section of its area thanin the remainder of the sheet and Weakened throughout a portion of thesaid section.

JOSEPH O. DECKERT.

Witnesses:

JOHN A. VVIEDERSHEIH, C. D. MoVAY.

